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510 lines
11 KiB
510 lines
11 KiB
// SPDX-License-Identifier: GPL-1.0+ |
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// |
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// Copyright (c) 2008 Simtec Electronics |
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// http://armlinux.simtec.co.uk/ |
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// Ben Dooks <[email protected]>, <[email protected]> |
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// |
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// Samsung ADC device core |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/platform_device.h> |
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#include <linux/sched.h> |
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#include <linux/list.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/clk.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/regulator/consumer.h> |
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#include "regs-adc.h" |
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#include <linux/soc/samsung/s3c-adc.h> |
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/* This driver is designed to control the usage of the ADC block between |
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* the touchscreen and any other drivers that may need to use it, such as |
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* the hwmon driver. |
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* |
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* Priority will be given to the touchscreen driver, but as this itself is |
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* rate limited it should not starve other requests which are processed in |
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* order that they are received. |
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* |
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* Each user registers to get a client block which uniquely identifies it |
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* and stores information such as the necessary functions to callback when |
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* action is required. |
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*/ |
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enum s3c_cpu_type { |
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TYPE_ADCV1, /* S3C24XX */ |
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TYPE_ADCV11, /* S3C2443 */ |
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TYPE_ADCV12, /* S3C2416, S3C2450 */ |
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TYPE_ADCV2, /* S3C64XX */ |
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TYPE_ADCV3, /* S5PV210, S5PC110, Exynos4210 */ |
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}; |
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struct s3c_adc_client { |
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struct platform_device *pdev; |
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struct list_head pend; |
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wait_queue_head_t *wait; |
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unsigned int nr_samples; |
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int result; |
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unsigned char is_ts; |
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unsigned char channel; |
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void (*select_cb)(struct s3c_adc_client *c, unsigned selected); |
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void (*convert_cb)(struct s3c_adc_client *c, |
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unsigned val1, unsigned val2, |
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unsigned *samples_left); |
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}; |
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struct adc_device { |
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struct platform_device *pdev; |
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struct platform_device *owner; |
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struct clk *clk; |
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struct s3c_adc_client *cur; |
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struct s3c_adc_client *ts_pend; |
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void __iomem *regs; |
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spinlock_t lock; |
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unsigned int prescale; |
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int irq; |
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struct regulator *vdd; |
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}; |
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static struct adc_device *adc_dev; |
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static LIST_HEAD(adc_pending); /* protected by adc_device.lock */ |
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#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg) |
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static inline void s3c_adc_convert(struct adc_device *adc) |
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{ |
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unsigned con = readl(adc->regs + S3C2410_ADCCON); |
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con |= S3C2410_ADCCON_ENABLE_START; |
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writel(con, adc->regs + S3C2410_ADCCON); |
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} |
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static inline void s3c_adc_select(struct adc_device *adc, |
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struct s3c_adc_client *client) |
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{ |
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unsigned con = readl(adc->regs + S3C2410_ADCCON); |
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enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data; |
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client->select_cb(client, 1); |
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if (cpu == TYPE_ADCV1 || cpu == TYPE_ADCV2) |
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con &= ~S3C2410_ADCCON_MUXMASK; |
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con &= ~S3C2410_ADCCON_STDBM; |
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con &= ~S3C2410_ADCCON_STARTMASK; |
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if (!client->is_ts) { |
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if (cpu == TYPE_ADCV3) |
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writel(client->channel & 0xf, adc->regs + S5P_ADCMUX); |
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else if (cpu == TYPE_ADCV11 || cpu == TYPE_ADCV12) |
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writel(client->channel & 0xf, |
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adc->regs + S3C2443_ADCMUX); |
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else |
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con |= S3C2410_ADCCON_SELMUX(client->channel); |
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} |
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writel(con, adc->regs + S3C2410_ADCCON); |
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} |
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static void s3c_adc_dbgshow(struct adc_device *adc) |
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{ |
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adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n", |
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readl(adc->regs + S3C2410_ADCCON), |
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readl(adc->regs + S3C2410_ADCTSC), |
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readl(adc->regs + S3C2410_ADCDLY)); |
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} |
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static void s3c_adc_try(struct adc_device *adc) |
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{ |
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struct s3c_adc_client *next = adc->ts_pend; |
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if (!next && !list_empty(&adc_pending)) { |
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next = list_first_entry(&adc_pending, |
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struct s3c_adc_client, pend); |
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list_del(&next->pend); |
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} else |
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adc->ts_pend = NULL; |
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if (next) { |
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adc_dbg(adc, "new client is %p\n", next); |
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adc->cur = next; |
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s3c_adc_select(adc, next); |
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s3c_adc_convert(adc); |
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s3c_adc_dbgshow(adc); |
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} |
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} |
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int s3c_adc_start(struct s3c_adc_client *client, |
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unsigned int channel, unsigned int nr_samples) |
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{ |
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struct adc_device *adc = adc_dev; |
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unsigned long flags; |
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if (!adc) { |
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printk(KERN_ERR "%s: failed to find adc\n", __func__); |
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return -EINVAL; |
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} |
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spin_lock_irqsave(&adc->lock, flags); |
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if (client->is_ts && adc->ts_pend) { |
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spin_unlock_irqrestore(&adc->lock, flags); |
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return -EAGAIN; |
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} |
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client->channel = channel; |
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client->nr_samples = nr_samples; |
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if (client->is_ts) |
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adc->ts_pend = client; |
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else |
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list_add_tail(&client->pend, &adc_pending); |
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if (!adc->cur) |
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s3c_adc_try(adc); |
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spin_unlock_irqrestore(&adc->lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(s3c_adc_start); |
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static void s3c_convert_done(struct s3c_adc_client *client, |
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unsigned v, unsigned u, unsigned *left) |
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{ |
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client->result = v; |
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wake_up(client->wait); |
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} |
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int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch) |
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{ |
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DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake); |
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int ret; |
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client->convert_cb = s3c_convert_done; |
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client->wait = &wake; |
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client->result = -1; |
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ret = s3c_adc_start(client, ch, 1); |
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if (ret < 0) |
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goto err; |
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ret = wait_event_timeout(wake, client->result >= 0, HZ / 2); |
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if (client->result < 0) { |
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ret = -ETIMEDOUT; |
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goto err; |
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} |
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client->convert_cb = NULL; |
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return client->result; |
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err: |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(s3c_adc_read); |
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static void s3c_adc_default_select(struct s3c_adc_client *client, |
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unsigned select) |
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{ |
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} |
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struct s3c_adc_client *s3c_adc_register(struct platform_device *pdev, |
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void (*select)(struct s3c_adc_client *client, |
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unsigned int selected), |
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void (*conv)(struct s3c_adc_client *client, |
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unsigned d0, unsigned d1, |
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unsigned *samples_left), |
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unsigned int is_ts) |
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{ |
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struct s3c_adc_client *client; |
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WARN_ON(!pdev); |
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if (!select) |
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select = s3c_adc_default_select; |
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if (!pdev) |
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return ERR_PTR(-EINVAL); |
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client = kzalloc(sizeof(*client), GFP_KERNEL); |
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if (!client) |
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return ERR_PTR(-ENOMEM); |
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client->pdev = pdev; |
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client->is_ts = is_ts; |
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client->select_cb = select; |
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client->convert_cb = conv; |
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return client; |
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} |
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EXPORT_SYMBOL_GPL(s3c_adc_register); |
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void s3c_adc_release(struct s3c_adc_client *client) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&adc_dev->lock, flags); |
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/* We should really check that nothing is in progress. */ |
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if (adc_dev->cur == client) |
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adc_dev->cur = NULL; |
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if (adc_dev->ts_pend == client) |
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adc_dev->ts_pend = NULL; |
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else { |
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struct list_head *p, *n; |
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struct s3c_adc_client *tmp; |
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list_for_each_safe(p, n, &adc_pending) { |
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tmp = list_entry(p, struct s3c_adc_client, pend); |
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if (tmp == client) |
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list_del(&tmp->pend); |
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} |
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} |
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if (adc_dev->cur == NULL) |
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s3c_adc_try(adc_dev); |
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spin_unlock_irqrestore(&adc_dev->lock, flags); |
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kfree(client); |
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} |
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EXPORT_SYMBOL_GPL(s3c_adc_release); |
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static irqreturn_t s3c_adc_irq(int irq, void *pw) |
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{ |
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struct adc_device *adc = pw; |
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struct s3c_adc_client *client = adc->cur; |
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enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data; |
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unsigned data0, data1; |
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if (!client) { |
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dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__); |
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goto exit; |
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} |
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data0 = readl(adc->regs + S3C2410_ADCDAT0); |
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data1 = readl(adc->regs + S3C2410_ADCDAT1); |
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adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1); |
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client->nr_samples--; |
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if (cpu == TYPE_ADCV1 || cpu == TYPE_ADCV11) { |
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data0 &= 0x3ff; |
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data1 &= 0x3ff; |
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} else { |
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/* S3C2416/S3C64XX/S5P ADC resolution is 12-bit */ |
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data0 &= 0xfff; |
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data1 &= 0xfff; |
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} |
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if (client->convert_cb) |
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(client->convert_cb)(client, data0, data1, &client->nr_samples); |
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if (client->nr_samples > 0) { |
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/* fire another conversion for this */ |
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client->select_cb(client, 1); |
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s3c_adc_convert(adc); |
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} else { |
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spin_lock(&adc->lock); |
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(client->select_cb)(client, 0); |
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adc->cur = NULL; |
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s3c_adc_try(adc); |
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spin_unlock(&adc->lock); |
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} |
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exit: |
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if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3) { |
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/* Clear ADC interrupt */ |
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writel(0, adc->regs + S3C64XX_ADCCLRINT); |
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} |
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return IRQ_HANDLED; |
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} |
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static int s3c_adc_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct adc_device *adc; |
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enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data; |
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int ret; |
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unsigned tmp; |
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adc = devm_kzalloc(dev, sizeof(*adc), GFP_KERNEL); |
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if (!adc) |
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return -ENOMEM; |
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spin_lock_init(&adc->lock); |
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adc->pdev = pdev; |
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adc->prescale = S3C2410_ADCCON_PRSCVL(49); |
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adc->vdd = devm_regulator_get(dev, "vdd"); |
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if (IS_ERR(adc->vdd)) { |
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dev_err(dev, "operating without regulator \"vdd\" .\n"); |
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return PTR_ERR(adc->vdd); |
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} |
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adc->irq = platform_get_irq(pdev, 1); |
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if (adc->irq <= 0) |
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return -ENOENT; |
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ret = devm_request_irq(dev, adc->irq, s3c_adc_irq, 0, dev_name(dev), |
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adc); |
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if (ret < 0) { |
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dev_err(dev, "failed to attach adc irq\n"); |
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return ret; |
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} |
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adc->clk = devm_clk_get(dev, "adc"); |
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if (IS_ERR(adc->clk)) { |
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dev_err(dev, "failed to get adc clock\n"); |
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return PTR_ERR(adc->clk); |
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} |
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adc->regs = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(adc->regs)) |
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return PTR_ERR(adc->regs); |
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ret = regulator_enable(adc->vdd); |
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if (ret) |
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return ret; |
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clk_prepare_enable(adc->clk); |
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tmp = adc->prescale | S3C2410_ADCCON_PRSCEN; |
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/* Enable 12-bit ADC resolution */ |
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if (cpu == TYPE_ADCV12) |
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tmp |= S3C2416_ADCCON_RESSEL; |
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if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3) |
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tmp |= S3C64XX_ADCCON_RESSEL; |
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writel(tmp, adc->regs + S3C2410_ADCCON); |
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dev_info(dev, "attached adc driver\n"); |
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platform_set_drvdata(pdev, adc); |
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adc_dev = adc; |
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return 0; |
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} |
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static int s3c_adc_remove(struct platform_device *pdev) |
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{ |
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struct adc_device *adc = platform_get_drvdata(pdev); |
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clk_disable_unprepare(adc->clk); |
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regulator_disable(adc->vdd); |
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return 0; |
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} |
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#ifdef CONFIG_PM |
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static int s3c_adc_suspend(struct device *dev) |
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{ |
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struct adc_device *adc = dev_get_drvdata(dev); |
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unsigned long flags; |
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u32 con; |
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spin_lock_irqsave(&adc->lock, flags); |
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con = readl(adc->regs + S3C2410_ADCCON); |
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con |= S3C2410_ADCCON_STDBM; |
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writel(con, adc->regs + S3C2410_ADCCON); |
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disable_irq(adc->irq); |
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spin_unlock_irqrestore(&adc->lock, flags); |
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clk_disable(adc->clk); |
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regulator_disable(adc->vdd); |
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return 0; |
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} |
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static int s3c_adc_resume(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct adc_device *adc = platform_get_drvdata(pdev); |
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enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data; |
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int ret; |
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unsigned long tmp; |
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ret = regulator_enable(adc->vdd); |
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if (ret) |
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return ret; |
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clk_enable(adc->clk); |
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enable_irq(adc->irq); |
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tmp = adc->prescale | S3C2410_ADCCON_PRSCEN; |
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/* Enable 12-bit ADC resolution */ |
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if (cpu == TYPE_ADCV12) |
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tmp |= S3C2416_ADCCON_RESSEL; |
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if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3) |
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tmp |= S3C64XX_ADCCON_RESSEL; |
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writel(tmp, adc->regs + S3C2410_ADCCON); |
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return 0; |
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} |
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#else |
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#define s3c_adc_suspend NULL |
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#define s3c_adc_resume NULL |
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#endif |
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static const struct platform_device_id s3c_adc_driver_ids[] = { |
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{ |
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.name = "s3c24xx-adc", |
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.driver_data = TYPE_ADCV1, |
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}, { |
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.name = "s3c2443-adc", |
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.driver_data = TYPE_ADCV11, |
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}, { |
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.name = "s3c2416-adc", |
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.driver_data = TYPE_ADCV12, |
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}, { |
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.name = "s3c64xx-adc", |
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.driver_data = TYPE_ADCV2, |
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}, { |
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.name = "samsung-adc-v3", |
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.driver_data = TYPE_ADCV3, |
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}, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(platform, s3c_adc_driver_ids); |
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static const struct dev_pm_ops adc_pm_ops = { |
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.suspend = s3c_adc_suspend, |
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.resume = s3c_adc_resume, |
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}; |
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static struct platform_driver s3c_adc_driver = { |
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.id_table = s3c_adc_driver_ids, |
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.driver = { |
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.name = "s3c-adc", |
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.pm = &adc_pm_ops, |
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}, |
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.probe = s3c_adc_probe, |
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.remove = s3c_adc_remove, |
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}; |
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static int __init adc_init(void) |
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{ |
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int ret; |
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ret = platform_driver_register(&s3c_adc_driver); |
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if (ret) |
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printk(KERN_ERR "%s: failed to add adc driver\n", __func__); |
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return ret; |
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} |
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module_init(adc_init);
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